namespace BucketChain;

/// <summary>
///     Represents a well which provides water for fighting the fire.
/// </summary>
public sealed class Well
{
    private readonly double _maxCapacity;
    private readonly double _refillRate;

    /// <summary>
    ///     Creates a new well with the supplied properties.
    ///     Initially the well is filled to the brim.
    /// </summary>
    /// <param name="maxCapacity">The max. fill level of the well in liters.</param>
    /// <param name="refillRate">The amount of liters by which this well is refilled each (chain)
    ///     operation step</param>
    public Well(double maxCapacity, double refillRate)
    {
        _maxCapacity = maxCapacity;
        _refillRate = refillRate;
        LitersRemaining = maxCapacity;
    }

    /// <summary>
    ///     Gets how many liters currently remain in the well.
    ///     Cannot exceed the max. capacity of the well or drop below 0.
    /// </summary>
    public double LitersRemaining { get; private set; }

    /// <summary>
    ///     Refills the well by the constant rate.
    /// </summary>
    public void Refill()
    {
        LitersRemaining = LitersRemaining + _refillRate > _maxCapacity
            ? _maxCapacity
            : LitersRemaining + _refillRate;
    }

    /// <summary>
    ///     Fills the passed bucket.
    ///     Can provide at most the <see cref="LitersRemaining"/> and only subtracts the
    ///     amount actually required to fill the bucket.
    /// </summary>
    /// <param name="bucket">The bucket to fill</param>
    public void FillBucket(Bucket bucket)
    {
        var litersTaken = bucket.Fill(LitersRemaining);
        LitersRemaining -= litersTaken;
    }

    /// <summary>
    ///     Creates a string representation of this well.
    ///     Shows the current and max. amount of liters - rounded to whole numbers.
    /// </summary>
    /// <returns>String representation of the well</returns>
    public override string ToString() => $"💧 {Math.Round(LitersRemaining)}/{Math.Round(_maxCapacity)}";
}